產(chǎn)品詳情

General Description

The G5719C is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 50μA and drops to <1μA in shutdown. The 2.5V to 6V input voltage range makes the G5719C ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery run time in portable systems. Switching frequency is internally set at 1MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increase efficiency and eliminates the need for an external Schottky diode. Built-in soft start function eliminates in-rush current that could damage the system. Output latch-off operation protects the step-down regulator from damage under short circuit and overvoltage conditions.

Features

■ High Efficiency: Up to 95%

■ Low Quiescent Current: Only 50μA During Operation

■ Internal Soft Start Function

■ Output Current

G5719CTB1U: 2A Continuous, 3A Peak

G5719CRC1U: 3A Continuous

■ 2.5V to 6V Input Voltage Range

■ 1MHz Switching Frequency

■ No Schottky Diode Required

■ 100% Duty Cycle in Dropout Operation

■ 0.6V Reference Allows Low Output Voltages

■ <1μA Shutdown Current

■ Current Mode Operation for Excellent Line and Load Transient Response

■ Over Temperature Protected

■ RoHS Compliant

■ Power Good

■ Output Short Circuit Latch-off Protection

■ Output Overvoltage Latch-off Protection

Applications

■ Cellular Telephones

■ Personal Information Appliances

■ Microprocessors and DSP Core Supplies

■ Wireless and DSL Modems

■ Digital Still and Video Cameras

■ MP3 Players

■ Portable Instruments